Overhead Allocation

What is overhead allocation?

Overhead allocation (also called indirect cost allocation or overhead apportionment) is the method of distributing shared business expenses across the revenue-generating units of a company. These shared expenses — rent, insurance, executive salaries, IT infrastructure, finance team costs — don't belong to any single product or department. Allocation assigns them proportionally so operators can calculate true unit economics.

Without overhead allocation, profitability analysis stops at gross margin. You know how much it costs to produce a product, but not how much of the office lease, the finance team's salary, or the ERP subscription that product should carry. Two product lines with identical gross margins can have wildly different true profitability once overhead is distributed.

For mid-market B2B companies ($5M-$30M revenue), overhead typically represents 15-30% of total revenue. Companies on the lower end have lean support functions. Companies on the higher end often carry overhead from an earlier growth phase that no one has restructured. The right allocation method reveals which lines are subsidizing others.

Overhead allocation is distinct from COGS attribution. COGS covers direct costs tied to producing or delivering the product. Overhead covers everything else that keeps the business running but cannot be traced directly to a single unit of output.

Why overhead allocation matters for operators

Most operators track gross margin and call it profitability. That misses 15-30% of total costs. A product line showing 68% gross margin may show 31% margin after overhead — or 52%, depending on how much support it actually consumes. You cannot make rational investment decisions without this number.

The cost of ignoring allocation shows up in portfolio decisions. Companies routinely invest in product lines that appear profitable at the gross margin level but destroy value once allocated costs are included. A typical 80-person SaaS company carrying $1.8M in annual overhead discovers that their secondary product line — seemingly profitable at 55% gross margin — drops to 8% margin after allocation because it consumes a disproportionate share of support and engineering resources.

Overhead allocation also prevents political budget fights. When every department agrees on the allocation methodology upfront, quarterly cost reviews become data conversations instead of blame sessions.

Overhead allocation formula

Overhead Rate = Total Overhead Costs / Allocation Base

Cost Allocated to Unit = Overhead Rate x Unit's Share of Base

Example (revenue-based allocation):
- Total overhead: $1,740,000 / year
- Total company revenue: $12,200,000
- Overhead rate: $1,740,000 / $12,200,000 = 14.3%

Product A revenue: $7,800,000
Product A allocated overhead: $7,800,000 x 14.3% = $1,115,400

Product B revenue: $4,400,000
Product B allocated overhead: $4,400,000 x 14.3% = $629,200

Common allocation bases:

• Revenue: Simplest. Works when products consume overhead roughly in proportion to revenue. Breaks down when a low-revenue product requires heavy support.
• Headcount: Allocates by team size. Better when overhead correlates with people (office space, IT, HR). Used by most SaaS companies under $20M.
• Direct labor hours: Traditional manufacturing approach. Useful when overhead correlates with production time. Less relevant for software.
• Activity-based costing (ABC): Allocates based on actual activities consumed. Most accurate, most complex. Practical above $30M revenue.

Overhead allocation benchmarks by company type

How overhead as a percentage of revenue varies across B2B segments. Lower is not always better — underinvestment in support functions creates hidden costs.

Sources: SaaStr 2025 Benchmark Report (SaaS segments), Pavilion COO Survey 2025, industry-observed ranges based on operator reports.

Common mistakes when allocating overhead

1. Using a single allocation base for everything

Revenue-based allocation is popular because it is simple. But it distorts results when products consume overhead differently. A low-revenue enterprise product that requires 40% of your support team's time gets undercharged. Use multiple bases — headcount for people-related overhead, revenue for sales-related, square footage for facilities.

2. Allocating overhead annually instead of quarterly

Companies calculate overhead rates once a year and apply them for 12 months. Costs shift. A Q1 rate applied in Q4 after two new hires and an office expansion produces meaningless numbers. Recalculate quarterly at minimum.

3. Including one-time costs in recurring overhead

A $200K office buildout or a $150K legal settlement should not be spread across product margins for the next 12 months. Separate non-recurring items from the overhead pool. Otherwise every product looks artificially unprofitable in the year of a large one-time expense.

4. Treating all departments equally

Some departments serve specific products disproportionately. If 70% of your customer success team supports Product A, allocating their cost equally across three products understates Product A's true cost and overstates the others.

How Fairview tracks overhead allocation automatically

Fairview's Margin Intelligence connects to your accounting platform (QuickBooks, Xero) and categorizes expenses as direct or overhead automatically based on your chart of accounts. You choose the allocation base — revenue, headcount, or custom — and Fairview distributes overhead to each product line, channel, or department.

The Operating Dashboard displays post-allocation margin alongside gross margin and contribution margin. When overhead as a percentage of revenue rises above your threshold, the Next-Best Action Engine flags it: "Overhead ratio increased from 19% to 24% QoQ. G&A grew 31% while revenue grew 8%. Review administrative headcount."

→ See how Margin Intelligence works

Overhead allocation vs direct cost allocation

Direct cost allocation is objective: you can see which product consumed the materials. Overhead allocation requires a method, and the method shapes the answer. That is why the choice of allocation base matters more than the math.

FAQ

What is overhead allocation in simple terms?

Overhead allocation takes the shared costs of running a business — rent, utilities, software, administrative salaries — and divides them across your products or departments. It answers: "How much of our overhead should each product line carry?" Without it, you only see gross margin. With it, you see whether a product actually makes money after its share of the whole operation.

What is a good overhead-to-revenue ratio for a B2B SaaS company?

For growth-stage SaaS ($5-20M ARR), overhead between 14-20% of revenue is considered well-managed. Above 28% signals bloated G&A or an office footprint that has outgrown the team. Early-stage companies run higher (18-32%) because fixed costs are spread across a smaller revenue base.

How do you calculate an overhead allocation rate?

Divide total overhead costs by the chosen allocation base. If total overhead is $1.74M and total revenue is $12.2M, the rate is 14.3%. Apply that rate to each unit. Product A with $7.8M revenue carries $1.12M in allocated overhead. Recalculate quarterly as costs and revenue shift.

What is the difference between overhead allocation and activity-based costing?

Overhead allocation uses a single rate applied uniformly (e.g., 14% of revenue). Activity-based costing (ABC) traces each overhead category to the specific activities that cause it — then allocates based on actual consumption. ABC is more accurate but requires more data. Most B2B companies under $30M use simple allocation; larger companies benefit from ABC.

How often should you review overhead allocation?

Quarterly at minimum. Annual reviews miss mid-year cost changes — new hires, tool additions, office expansions. Companies that reallocate quarterly catch margin drift 3 months earlier than those using annual rates. Update the allocation base whenever the business adds a material new cost center.

What types of costs count as overhead?

Overhead includes any cost that cannot be directly traced to producing a specific product: rent, utilities, insurance, administrative salaries, accounting software, legal fees, office supplies, and IT infrastructure. It does not include COGS (direct materials, hosting, direct labor) or sales commissions tied to specific deals.

Related terms

• COGS (Cost of Goods Sold) — Direct costs of producing a product, distinct from overhead
• Contribution Margin — Revenue minus all variable costs, sits between gross margin and EBITDA
• EBITDA — Earnings before interest, taxes, depreciation, and amortization — the profitability layer that includes overhead
• Gross Margin — Revenue minus COGS only, does not include allocated overhead
• Unit Economics — Per-customer or per-unit profitability, requires accurate overhead allocation to calculate fully

Fairview is an operating intelligence platform that tracks overhead allocation alongside gross margin, contribution margin, and EBITDA. Start your free trial →

Siddharth Gangal is the founder of Fairview. He built automated overhead tracking into the platform after watching operators argue over cost allocation in spreadsheets — each department producing a different version of "true" profitability.